<?
class T_Resizeimage
{
   //图片类型
   var $type;
   //实际宽度
   var $width;
   //实际高度
   var $height;
   //改变后的宽度
   var $resize_width;
   //改变后的高度
   var $resize_height;
   //是否裁图
   var $cut;
   //源图象
   var $srcimg;
   //目标图象地址[separator]
   var $dstimg;
   //临????建的图象
   var $im;
   
	var $permission = array(
						'image/jpeg'=>"jpg", 
						'image/gif'=>"gif",
						'image/png'=>"png"
						);
function T_Resizeimage($img, $wid, $hei,$c,$top=0,$left=0,$t=0,$name='')
   {
       $this->srcimg = $img;
       $this->resize_width = $wid;
       $this->resize_height = $hei;
       $this->cut = $c;
       //图片的类型
      
       $this->type = $this->get_extend($img);
       //初始化图象
       $this->initi_img();
       //目标图象地址
       $this -> dst_img($name);
       //--
       $this->width = imagesx($this->im);
       $this->height = imagesy($this->im);
       //生成图象
       $this->newimg($top,$left,$t,$w);
       ImageDestroy ($this->im);
   }
	function get_extend($img)
	{
		$type=getimagesize($img);
		
		$img_type=$type[mime];
		$end = $this->permission[$img_type];	
	    return $end;
	}
   function newimg($top =0 ,$left = 0, $t=0)
   {
       //改变后的图象的比例
       $resize_ratio = ($this->resize_width)/($this->resize_height);
       //实际图象的比例
       $ratio = ($this->width)/($this->height);
       if(($this->cut)=="1")
       //裁图
       {
       	   if($t)
       	   {
       	   		   $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
	               imagecopyresampled($newimg, $this->im, 0, 0, $top, $left, $this->resize_width,$this->resize_height, $t, $t);
	               $this->end_img($newimg);
       	   }
       	   else 
       	   {
	           if($ratio>=$resize_ratio)
	           //高度优先
	           {
	           	   if($resize_ratio == 1)
	           	   {
	           	   		$cha = ($this->width - $this->height) /2;
	           	   }
	               $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
	               imagecopyresampled($newimg, $this->im, 0, 0, $cha, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
	               $this->end_img($newimg);
	           }
	           if($ratio<$resize_ratio)
	           //宽度优先
	           {
	          	  if($resize_ratio == 1)
	           	   {
	           	   		$cha = ($this->height - $this->width) /2;
	           	   }
	               $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
	               imagecopyresampled($newimg, $this->im, 0, 0, 0, $cha, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
	               $this->end_img($newimg);
	           }
       	   }
       }
       else
       //不裁图
       {
       	   if($this->resize_width > $this->width && $this->resize_height > $this->height)	
       	   {
       	   	   $newimg = imagecreatetruecolor($this->width, $this->height);
               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->width,  $this->height, $this->width, $this->height);
               $this->end_img($newimg);
               return;
       	   }
           if($ratio>=$resize_ratio)
           {
               $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
                $this->end_img($newimg);
           }
           if($ratio<$resize_ratio)
           {
               $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
               $this->end_img($newimg);
           }
       }
   }
   function end_img($newimg)
   {
    	if($this->type=="jpg")
       {
          imagejpeg($newimg,$this->dstimg);
       }
       if($this->type=="gif")
       {
          imagegif($newimg,$this->dstimg);
       }
       if($this->type=="png")
       {
           imagepng($newimg,$this->dstimg);
       }
   }
   //初始化图象
   function initi_img()
   {
       if($this->type=="jpg")
       {
           $this->im = imagecreatefromjpeg($this->srcimg);
       }
       if($this->type=="gif")
       {
           $this->im = imagecreatefromgif($this->srcimg);
       }
       if($this->type=="png")
       {
           $this->im = imagecreatefrompng($this->srcimg);
       }
   }
   //图象目标地址
   function dst_img($picname = '')
   {
       $full_length  = strlen($this->srcimg);
       $type_length  = strlen($this->type);
       $name_length  = $full_length-$type_length;
       $name         = substr($this->srcimg,0,$name_length-1);
       if($picname)
       {
       		$this->dstimg = $picname."_".$this->resize_width."X".$this->resize_height.".".$this->type;
       }
       else 
       {
       		$this->dstimg = $name."_".$this->resize_width."X".$this->resize_height.".".$this->type;
       }
      
   }
}
//$resizeimage = new resizeimage("E:\例子\php\myself-class\图片剪裁\ee_small.jpg", "200", "200",1);
?>